PCB knowledge

Luam Circuit Board (PCB) luv rau Printed Circuit Board. Feem ntau hauv cov khoom siv rwb thaiv tsev, raws li kev tsim ua ntej, ua los ntawm cov ntawv luam tawm, luam tawm cov khoom lossis ua ke ntawm ob qho tib si cov duab kos npe hu ua luam tawm Circuit. Cov duab hluav taws xob ntawm cov hluav taws xob sib txuas ntawm cov khoom siv tau muab rau hauv cov insulating substrate hu ua luam tawm Circuit. Ua li no, daim ntawv luam tawm lossis kab ntawv luam tawm ntawm lub rooj tsav khoom tiav tau hu ua luam tawm Circuit board, tseem hu ua daim txiag luam ntawv lossis luam tawm Circuit board.

PCB is indispensable for almost all electronic equipment we can see, from electronic watches, calculators and general computers to computers, communication electronic equipment and military weapon systems. As long as there are no electronic components such as integrated circuits, PCB is used for the electrical interconnection between them. It provides mechanical support for fixed assembly of various electronic components such as integrated circuits, realizes wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provides required electrical characteristics, such as characteristic impedance, etc. At the same time to provide automatic solder blocking graph; Provide identification characters and graphics for component installation, inspection and maintenance.

How are PCBS made? When we open the thumb drive of a general-purpose computer, we can see a soft film (flexible insulating substrate) printed with silver-white (silver paste) conductive graphics and potential graphics. Because of the universal screen printing method to get this graph, so we call this printed circuit board flexible silver paste printed circuit board. Different from the motherboards, graphics cards, network cards, modems, sound cards and printed circuit boards on home appliances we see in Computer City. The base material used is made of paper base (usually used for single side) or glass cloth base (often used for double-sided and multi-layer), pre-impregnated phenolic or epoxy resin, one or both sides of the surface glued with copper book and then laminated curing. This kind of circuit board covers copper book board, we call it rigid board. Then we make a printed circuit board, we call it a rigid printed circuit board. A printed circuit board with printed circuit graphics on one side is called a single-sided printed circuit board, and a printed circuit board with printed circuit graphics on both sides is interconnected on both sides through the metallization of holes, and we call it a double-panel. If using a double lining, two one-way for outer layer or two double lining, two blocks of single outer layer of the printed circuit board, through the positioning system and alternate insulation adhesive materials and conductive graphics interconnection according to design requirement of printed circuit board becomes four, six layer printed circuit board, also known as multilayer printed circuit board. There are now more than 100 layers of practical printed circuit boards.

Cov txheej txheem ntau lawm PCB is relatively complex, which involves a wide range of processes, from simple mechanical processing to complex mechanical processing, including common chemical reactions, photochemistry, electrochemistry, thermochemistry and other processes, computer-aided design (CAM) and other knowledge. And in the process of production process problems and will always meet new problems and some problems in didn’t find out the reason disappears, because its production process is a kind of continuous line form, any link wrong would caused production across the board or the consequences of a large number of scrap, printed circuit board if there is no recycling scrap, Process engineers can be stressful, so many engineers leave the industry to work in sales and technical services for PCB equipment or materials companies.

Txhawm rau kom nkag siab PCB ntau ntxiv, nws yog qhov tsim nyog kom nkag siab cov txheej txheem tsim khoom ntawm ib leeg ib sab, muab ob npaug rau ob tog luam tawm Circuit board thiab cov rooj sib txig sib luag, kom nkag siab tob dua ntawm nws.

Ib sab ib sab tawv luam tawm pawg thawj coj saib:-ib leeg tooj liab clad-blanking rau txhuam, qhuav), drilling lossis xuas nrig ntaus-> tshuaj ntsuam kab ntawv kab ntawv etched qauv lossis siv cov zaj duab xis qhuav tiv thaiv kom kho kho phaj, tooj liab etching thiab qhuav kom tiv cov ntawv luam, txhuam, qhuav, tshuaj ntsuam luam tawm tsis kam siv cov duab (feem ntau siv roj ntsuab), UV tua rau tus cim kos duab duab luam ntawv, UV tua, preheating, xuas nrig ntaus, thiab cov duab-hluav taws xob qhib thiab luv Circuit Court kuaj-txhuam, ziab → ua ntej txheej vuam anti-oxidant (qhuav) lossis tin-txau cov cua kub ua kom sov → tshuaj xyuas ntim → cov khoom tiav lub Hoobkas.

Muab ob npaug rau ob sab tawv luam tawm lub rooj tsavxwm:-ob tog ob tog tooj liab-clad cov laug cam-khoob-laminated-nc laum qhia qhov-tshuaj xyuas, deburring txhuam-tshuaj plating (qhia qhov metallization)-nyias tooj liab plating (puv board)-tshuaj xyuas txhuam-> tshuaj ntsuam luam ntawv tsis zoo cov duab kos, kho (zaj duab xis qhuav/ntub zaj duab xis, raug thiab txhim kho) – tshuaj xyuas thiab kho cov phaj – kab duab plating thiab electroplating tin (corrosion tsis kam ntawm npib tsib xee/kub) -> luam tawm cov khoom (txheej) – etching tooj liab – (annealing tin) txhawm rau txhuam kom huv, feem ntau siv cov duab tshuaj ntsuam luam tawm tsis kam siv cov cua sov ua kom sov cov roj ntsuab (duab zaj duab xis qhuav lossis zaj duab xis ntub, nthuav tawm, txhim kho thiab kho cua sov, feem ntau cua sov kho cov xim ntsuab xim) thiab ntxuav kom huv, kom tshuaj ntsuam luam ntawv cim cim cov duab, kho, (tin lossis organic shielded vuam zaj duab xis) los ua cov txheej txheem, ntxuav, ziab rau hluav taws xob ntawm kev ntsuas tawm, ntim thiab cov khoom tiav.
Los ntawm qhov txheej txheem txheej txheem txheej txheem ntawm kev tsim cov txheej txheem ntau txheej ntws mus rau txheej txheej tooj liab clad txiav ob sab, txhuam kom txhawm rau txhawm rau qhov tso qhov, lo rau txheej qhuav lossis txheej kom tiv thaiv kom raug, txhim kho thiab etching thiab zaj duab xis-sab hauv coarsening thiab oxidation -daim tshev sab hauv-(txheej kab tsim ntawm ib leeg ib sab tooj liab clad laminates, B-daim ntawv sib txuas, phaj sib txuas daim ntawv tshuaj xyuas, laum qhov tso rau qhov) rau laminate, ob peb tswj kev drilling-> Qhov thiab tshuaj xyuas ua ntej kho thiab tshuaj tooj liab plating-tag nrho pawg thawj coj saib thiab nyias tooj liab plating txheej tshuaj xyuas – lo tiv thaiv kom qhuav zaj duab xis plating lossis txheej rau plating tus neeg sawv cev rau lub tsho hauv qab raug, kev txhim kho thiab kho cov phaj – kab duab electroplating – lossis npib tsib xee/kub plating thiab electroplating tin txhuas hlau rau zaj duab xis thiab kos duab – kos – tshuaj ntsuam luam tawm tsis kam siv cov duab lossis lub teeb ua kom tsis muaj zog vuam cov duab – luam cov cim duab – (huab cua kub lossis qib organicshielded vuam zaj duab xis) thiab cov lej tswj kev ntxuav lub cev → tu, ziab → hluav taws xob txuas kom pom → ua tiav khoom tshuaj xyuas → ntim lub Hoobkas.

Nws tuaj yeem pom los ntawm cov txheej txheem txheej txheem txheej txheem uas cov txheej txheem ntau txheej txheej tau tsim los ntawm txheej txheem ob lub ntsej muag metallization. Ntxiv rau cov txheej txheem ob tog, nws muaj ntau yam ntsiab lus tshwj xeeb: lub qhov hlau sib txuas sab hauv kev sib txuas, drilling thiab epoxy tshem tawm kev ua kom huv, tso qhov system, lamination, thiab cov khoom siv tshwj xeeb.

Peb daim npav lub rooj siv computer feem ntau yog siv daim iav epoxy iav ob npaug rau ob sab luam tawm Circuit Board, uas muaj ib sab tau tso cov khoom sib txuas thiab lwm sab yog cov tivthaiv ko taw vuam saum npoo, tuaj yeem pom tias cov pob qij txha txuas tau zoo li qub, tivthaiv ko taw tsis sib txuas nto ntawm cov pob qij txha txuas peb hu nws lub ncoo. Vim li cas ho tsis lwm cov xov tooj tooj liab muaj cov tin rau lawv? Vim tias ntxiv rau cov phaj phom thiab lwm qhov ntawm qhov xav tau rau kev siv dag zog, tas li ntawm qhov saum npoo muaj txheej txheej nthwv dej tsis kam vuam zaj duab xis. Nws cov yeeb yaj kiab saum npoo feem ntau yog ntsuab, thiab ob peb siv daj, dub, xiav, thiab lwm yam. Nws txoj haujlwm yog txhawm rau tiv thaiv nthwv dej vuam choj tshwm sim, txhim kho vuam zoo thiab txuag cov laug thiab lwm yam. Nws kuj tseem yog txheej txheem tiv thaiv ruaj khov ntawm cov ntawv luam tawm, tuaj yeem ua lub luag haujlwm ntawm kev ya raws, xeb, kab mob me me thiab kev ua haujlwm puas. Los ntawm sab nraud, qhov saum npoo yog du thiab ci ntsuab thaiv cov yeeb yaj kiab, uas yog qhov ntxim nyiam rau zaj duab xis phaj thiab cua sov kho cov roj ntsuab. Tsis yog tsuas yog cov tsos zoo dua, nws yog ib qho tseem ceeb uas cov ntaub ntawv raug siab yog siab, yog li txhawm rau txhim kho kev ntseeg tau ntawm cov khoom siv sib txuas.

Raws li peb tuaj yeem pom los ntawm lub khoos phis tawj tswj hwm, cov khoom siv tau teeb tsa hauv peb txoj hauv kev. Cov txheej txheem teeb tsa txuas rau kev xa mus uas cov khoom siv hluav taws xob tau tso rau hauv qhov hla ntawm lub tshuab luam ntawv Circuit Board. Nws yog qhov yooj yim kom pom tias ob npaug ntawm ob sab luam tawm lub rooj tsav xwm hauv Circuit Court los ntawm qhov yog raws li hauv qab no: ib qho yog ib qho yooj yim tivthaiv ntxig qhov; Qhov thib ob yog kev tiv thaiv kev tiv thaiv thiab ob tog sib txuas ua ke los ntawm lub qhov; Peb yog ib qho yooj yim ob tog los ntawm qhov; Plaub yog lub hauv paus phaj teeb tsa thiab muab tso rau qhov. Lwm qhov kev teeb tsa thib ob yog kev teeb tsa saum npoo thiab nti ncaj ncaj. Qhov tseeb, nti txuas ncaj qha thev naus laus zis tuaj yeem suav tias yog ib ceg ntawm kev siv tshuab thev naus laus zis, nws yog cov nti ncaj qha rau ntawm daim ntawv luam tawm, thiab tom qab ntawd txuas nrog lub rooj tsav xwm luam tawm los ntawm txoj kev siv hlau txuas lossis siv txoj siv thauj khoom, txoj kev ntxeev, nqaj hlau txoj kev thiab lwm yam ntim tshuab. Qhov vuam nto yog nyob ntawm qhov chaw tivthaiv.

Kev siv tshuab ntom ntom ntom ntom muaj qhov zoo hauv qab no:

1) Vim tias daim ntawv luam tawm feem ntau tshem tawm qhov loj los ntawm lub qhov lossis faus qhov sib txuas sib txuas thev naus laus zis, txhim kho cov xov hluav taws xob ntom ntom ntawm lub rooj tsav xwm luam tawm, txo thaj chaw luam ntawv (feem ntau ib feem peb ntawm kev teeb tsa ntsaws), thiab tseem tuaj yeem txo tus lej ntawm txheej txheej tsim thiab cov nqi ntawm daim ntawv luam tawm.

2) Txo qhov hnyav, txhim kho kev ua haujlwm seismic, kev siv colloidal solder thiab thev naus laus zis thev naus laus zis tshiab, txhim kho cov khoom lag luam zoo thiab ntseeg tau.

3) Vim tias qhov nce ntawm cov kab hluav taws xob ntom ntom thiab qhov ua kom luv ntawm cov hlau lead ntev, cov kab mob muaj peev xwm tiv thaiv kab mob thiab cov kab mob sib kis tau raug txo qis, uas yog qhov muaj txiaj ntsig zoo rau kev txhim kho cov hluav taws xob tsis ntawm cov ntawv luam tawm.

4) Nws yooj yim dua kom paub siv lub tshuab ua haujlwm zoo dua li kev teeb tsa ntsaws, txhim kho kev teeb tsa nrawm thiab tsim khoom tsim khoom, thiab txo nqi sib dhos raws li.

As can be seen from the above surface safety technology, the improvement of circuit board technology is improved with the improvement of chip packaging technology and surface mounting technology. The computer board that we see now card its surface stick installs rate to rise ceaselessly. In fact, this kind of circuit board reuse transmission screen printing line graphics is unable to meet the technical requirements. Therefore, the ordinary high precision circuit board, its line graphics and welding graphics are basically sensitive circuit and sensitive green oil cov txheej txheem ntau lawm.

Nrog rau kev txhim kho kev hloov pauv ntawm cov khoom siv hluav taws xob siab, cov khoom lag luam tsim khoom ntawm Circuit Board tau dhau los ua siab dua. Ntau thiab ntau cov thev naus laus zis tshiab tau siv rau kev tsim khoom ntawm lub rooj tsav xwm hauv Circuit Court, xws li tshuab thev naus laus zis, duab hluav taws xob thiab lwm yam. Cov lus saum toj no tsuas yog qee qhov qhia txog ntawm qhov saum npoo, muaj ntau yam hauv kev tsim khoom ntawm lub rooj tsav xwm hauv Circuit Court vim qhov chaw txwv, xws li qhov muag tsis pom qhov, lub rooj sib dhos winding, teflon board, photolithography thiab lwm yam. Yog tias koj xav kawm tob, koj yuav tsum ua haujlwm hnyav.